#include <memory.h>
#include <cstdio>

static int a[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
static int b[10] = {11, 12, 13, 14, 15, 16, 17, 18, 19, 20};

void q4_2_run_with_memcpy();
void q4_2_run_without_memcpy();